APPA multimeter driver

I bought myself an APPA 109 multimeter which has a PC interface using a serial port. Since it doesn't come with a Linux driver, I decided to write my own. The driver ought to work with any APPA 100 series multimeter with a serial port, but I have only tested it on my APPA 109.

The source code can be found in my subversion repository. The main program is in req.c, it's very dumb and just reads data from the serial port and prints it in a more readable format to standard output. There is also a small python program, appa.py, that uses the  Python StripChart widget from Jonathan Merritt to present the data graphically.